惠民凹陷阳信洼陷火成岩及其对油气成藏的影响

通过岩心观察、薄片鉴定、有机地球化学分析等技术手段,对阳信洼陷火成岩岩性特征、储集空间类型、物性特征及其对油气成藏的影响进行了分析,并进一步对阳信洼陷火成岩的发育和时空分布特征进行了研究。结果表明,阳信洼陷火成岩特别发育,火成岩的形成与分布主要受断裂活动的影响,同时火山活动对盆地演化、油气生成、圈闭形成和油气成藏具有一定的控制作用。火成岩及其岩浆作用有利于烃源岩的富集,提高了地温场,改变了地球化学场,促进了有机质生烃作用。阳信洼陷火成岩储集空间发育,具有油气充注率高、油气保存条件好的特点,有利于形成与火成岩有关的复合油气藏。

Characteristics of igneous rocks and their effects on hydrocarbon accumulation in Yangxin subsag of Huimin sag

The lithologic characteristics,reservoir space types, physical properties and their effects on hydrocarbon accumulation of igneous rocks in Yangxin subsag were studied by means of cores observation,thin-section identification and organic geochemical analysis.Igneous rocks are well developed in Yangxin subsag,the forming and distribution of igneous rocks are mainly effected by fault movement,also the volcanic activities have some controlling effects on basin evolution,hydrocarbon generation,traps formation,hydrocarbon accumulation.On the basis of analysis of the characteristics of igneous rocks development and spatial-temporal distribution,it is further found that igneous rocks and their magma have important effects on hydrocarbon accumulation.Volcanic activities are favorable for enrichment of source rock,and elevate the geothermal gradient,and make the geo-chemical field of the source rock change,and accelerate the hydrocarbon generation of organic matter.The multi-hydrocarbon reservoirs about igneous rocks can be formed because the reservoir spaces of igneous rocks are well developed and there are good filling ratio of hydrocarbon and preservation conditions in Yangxin subsag.